Hello and thank you for your quick replys.
Before you do anything else please read General guidance
How to use this forum
I have read it before posting and I have read it again. Please direct me to particular section of How to use this forum, because I don’t know where I went wrong (I am new to forums - never posted anything).
Please let me further explain my implementation and use of two Arduinos (long and boring, but I want you to understand me):
For the last 25 years I have been modeling and competing with free flight aircrafts (in short: models).
These models fly on their own, meaning they glide trough air with no external power assistance and no radio controll (everything has to be preset).
This sport (category F1A of Fédération Aéronautique Internationale) has become very hi-tec and expensive. Wings and fuselage build out of carbon fiber (not balsa wood as in the old days) and “mechanical timers” were swapped for micro controllers and servos (servos are controlling wings, rudder and horizontal stabilizer). There are few micro controllers developed especially for this category, but the cheapest one costs around 150 Euros (I have one build in my model). Minimum weight of model must be 410 grams and we (the competitors) are trying to come close to that limitation. Battery, micro controller, servos and some other things are all built in a fuselage with minimum space available.
2 or 3 years ago I was writing scripts for this project, then computer disk went corrupted and I have lost everything - even will to start all over again. Communication between Arduinos was through I2C. Maybe this time I will try with Serial communication (because of occasional freezing of master Arduino by unplugging the communication cable). It was even possible to drive servos (controlled by slave Arduino) and setting their position with a slider on LCD connected to master Arduino.
My goal is to lower the costs of a model and to compete with something that I created and developed (but I need your help to achieve that). Maybe in the future - if someone has an interest of having one build in their model, I would build them one (if I ever come so far with my skills and knowledge, I would like to build my own Arduino-based micro controller for use in F1A models.) for the costs of the parts required.
I have attached a photo of fuselage where I have a built in micro controller called Black magic which is connected with a Palm handheld. You can see there is not much space available. One photo attachment shows my connection of two Arduinos (sorry but I don’t have any schematics program).
Sorry for my sloppy English.